diff options
Diffstat (limited to 'drivers/s390/net/smsgiucv.c')
| -rw-r--r-- | drivers/s390/net/smsgiucv.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/s390/net/smsgiucv.c b/drivers/s390/net/smsgiucv.c new file mode 100644 index 000000000..066b5c3aa --- /dev/null +++ b/drivers/s390/net/smsgiucv.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * IUCV special message driver + * + * Copyright IBM Corp. 2003, 2009 + * + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <net/iucv/iucv.h> +#include <asm/cpcmd.h> +#include <asm/ebcdic.h> +#include "smsgiucv.h" + +struct smsg_callback { + struct list_head list; + const char *prefix; + int len; + void (*callback)(const char *from, char *str); +}; + +MODULE_AUTHOR + ("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)"); +MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver"); + +static struct iucv_path *smsg_path; +/* dummy device used as trigger for PM functions */ +static struct device *smsg_dev; + +static DEFINE_SPINLOCK(smsg_list_lock); +static LIST_HEAD(smsg_list); +static int iucv_path_connected; + +static int smsg_path_pending(struct iucv_path *, u8 *, u8 *); +static void smsg_message_pending(struct iucv_path *, struct iucv_message *); + +static struct iucv_handler smsg_handler = { + .path_pending = smsg_path_pending, + .message_pending = smsg_message_pending, +}; + +static int smsg_path_pending(struct iucv_path *path, u8 *ipvmid, u8 *ipuser) +{ + if (strncmp(ipvmid, "*MSG ", 8) != 0) + return -EINVAL; + /* Path pending from *MSG. */ + return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL); +} + +static void smsg_message_pending(struct iucv_path *path, + struct iucv_message *msg) +{ + struct smsg_callback *cb; + unsigned char *buffer; + unsigned char sender[9]; + int rc, i; + + buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA); + if (!buffer) { + iucv_message_reject(path, msg); + return; + } + rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL); + if (rc == 0) { + buffer[msg->length] = 0; + EBCASC(buffer, msg->length); + memcpy(sender, buffer, 8); + sender[8] = 0; + /* Remove trailing whitespace from the sender name. */ + for (i = 7; i >= 0; i--) { + if (sender[i] != ' ' && sender[i] != '\t') + break; + sender[i] = 0; + } + spin_lock(&smsg_list_lock); + list_for_each_entry(cb, &smsg_list, list) + if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) { + cb->callback(sender, buffer + 8); + break; + } + spin_unlock(&smsg_list_lock); + } + kfree(buffer); +} + +int smsg_register_callback(const char *prefix, + void (*callback)(const char *from, char *str)) +{ + struct smsg_callback *cb; + + cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL); + if (!cb) + return -ENOMEM; + cb->prefix = prefix; + cb->len = strlen(prefix); + cb->callback = callback; + spin_lock_bh(&smsg_list_lock); + list_add_tail(&cb->list, &smsg_list); + spin_unlock_bh(&smsg_list_lock); + return 0; +} + +void smsg_unregister_callback(const char *prefix, + void (*callback)(const char *from, + char *str)) +{ + struct smsg_callback *cb, *tmp; + + spin_lock_bh(&smsg_list_lock); + cb = NULL; + list_for_each_entry(tmp, &smsg_list, list) + if (tmp->callback == callback && + strcmp(tmp->prefix, prefix) == 0) { + cb = tmp; + list_del(&cb->list); + break; + } + spin_unlock_bh(&smsg_list_lock); + kfree(cb); +} + +static int smsg_pm_freeze(struct device *dev) +{ +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "smsg_pm_freeze\n"); +#endif + if (smsg_path && iucv_path_connected) { + iucv_path_sever(smsg_path, NULL); + iucv_path_connected = 0; + } + return 0; +} + +static int smsg_pm_restore_thaw(struct device *dev) +{ + int rc; + +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "smsg_pm_restore_thaw\n"); +#endif + if (smsg_path && !iucv_path_connected) { + memset(smsg_path, 0, sizeof(*smsg_path)); + smsg_path->msglim = 255; + smsg_path->flags = 0; + rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", + NULL, NULL, NULL); +#ifdef CONFIG_PM_DEBUG + if (rc) + printk(KERN_ERR + "iucv_path_connect returned with rc %i\n", rc); +#endif + if (!rc) + iucv_path_connected = 1; + cpcmd("SET SMSG IUCV", NULL, 0, NULL); + } + return 0; +} + +static const struct dev_pm_ops smsg_pm_ops = { + .freeze = smsg_pm_freeze, + .thaw = smsg_pm_restore_thaw, + .restore = smsg_pm_restore_thaw, +}; + +static struct device_driver smsg_driver = { + .owner = THIS_MODULE, + .name = SMSGIUCV_DRV_NAME, + .bus = &iucv_bus, + .pm = &smsg_pm_ops, +}; + +static void __exit smsg_exit(void) +{ + cpcmd("SET SMSG OFF", NULL, 0, NULL); + device_unregister(smsg_dev); + iucv_unregister(&smsg_handler, 1); + driver_unregister(&smsg_driver); +} + +static int __init smsg_init(void) +{ + int rc; + + if (!MACHINE_IS_VM) { + rc = -EPROTONOSUPPORT; + goto out; + } + rc = driver_register(&smsg_driver); + if (rc != 0) + goto out; + rc = iucv_register(&smsg_handler, 1); + if (rc) + goto out_driver; + smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL); + if (!smsg_path) { + rc = -ENOMEM; + goto out_register; + } + rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", + NULL, NULL, NULL); + if (rc) + goto out_free_path; + else + iucv_path_connected = 1; + smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!smsg_dev) { + rc = -ENOMEM; + goto out_free_path; + } + dev_set_name(smsg_dev, "smsg_iucv"); + smsg_dev->bus = &iucv_bus; + smsg_dev->parent = iucv_root; + smsg_dev->release = (void (*)(struct device *))kfree; + smsg_dev->driver = &smsg_driver; + rc = device_register(smsg_dev); + if (rc) + goto out_put; + + cpcmd("SET SMSG IUCV", NULL, 0, NULL); + return 0; + +out_put: + put_device(smsg_dev); +out_free_path: + iucv_path_free(smsg_path); + smsg_path = NULL; +out_register: + iucv_unregister(&smsg_handler, 1); +out_driver: + driver_unregister(&smsg_driver); +out: + return rc; +} + +module_init(smsg_init); +module_exit(smsg_exit); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL(smsg_register_callback); +EXPORT_SYMBOL(smsg_unregister_callback); |